Is HP ProLian DL 380 G5 Compatible with ESXi 5.5?

Hi,
I have HP Proliant DL 380 G5 Server with ESXi V4.0. I am going to upgrade it to ESXi V5.5.
However when I searched HP Proliant DL 380 G5 Server on VMware HCL List, I don't see the exact model. I see DL 380G6 and DL 380 G7 Models as seen in the screenshot.

The reasons for wanting to upgrade to newer than ESXi 5.1 are:
(1) To install VM Backup Software (NAKIVO)
(2) To be able to install Windows 7 OS. This is NOT a must, but would be nice.
But the daily backup is something I am missing.

@Andy,
"I see no reasons you have posted to go to 5.5, compared to 5.1. Nakivo works with 5.1, and Windows 7 can be installed on 5.1." --> I have no problem upgrading it to V5.1. In fact Nakivo told me that their software will work with ESXi V5.1. I also know, as you pointed out, I can install Windows 7 and Windows 2012.
So as long as it is safer to upgrade V4.0 to V 5.1, I am all for it.

@gheist
"You need firmware upgrade for 5.0 or 5.1" --> Let me read upon that. Have you done this personally? Is there anything that I have to keep in mind?

@gheist
"NOTICE: Access to the SPP now requires validation via the HP Support Center (HPSC). An active warranty or HP support agreement is required to download it." --> This HP Proliant DL380 G5 is 5 years old and I am 100% sure it is NOT under HP warranty.
I have not delployed ANY recent HP Servers in recent years that would have warranty coverage. I have switched to DELL server ...

Is there anyone out there with active HP warranty and download the file for me?

I will somehow get the firmware and apply it on the server. Provided that I am going to upgrade it to ESXi V5.1, let me ask you for your opinion. What would you do in this situation as to disaster recovery plan in concerned?
Other than downloading virtual machine folders using BROWSE DATABSE, what else would you do?

Will this work (please see the screenshot)? In one site that I manage, I purchased VSphere client with license and discovered that CLONE option is available. Since I purchased VSphere essentials yesterday for this site/customer, can I set up V5.5 on new hardware box/host (on a temporary basis) and add the V4 esx host host into Vshpere Client and perform "CLONE" operation on each VM so that it clones on to the new host?

Update:
Over the weekend, I upgraded V4.0 to V5.1 successfully.
During the week, I have talked to HP Tech Support. He confirmed that DL380 G5 Server is on V5.1 compatibility list on HP website. So I was more comfortable with proceeding with upgrade.
There were a couple of error messages that stopped the installation. So I had to change BIOS settings on two separate occasions in BIOS:
(1) Turn on INTEL Visualization Option.
(2) Enable "No Execute Memory Protection".

Uff ufff... Your old installation ran super slow.
Also in vmware knowledge base you will find that power regulator should be set into static high performance mode, because all other modes work only with windows.

"power regulator should be set into static high performance mode" --> Thanks for the information. For now since ESXi V5.1 is running without a problem, I will keep it as it is, but If the performance becomes an issue, I will try that.

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